Function evaluateMessageDescriptor

packages/babel-plugin-formatjs/utils.ts:93–153

(
  descriptorPath: MessageDescriptorPath,
  isJSXSource = false,
  filename: string | undefined,
  idInterpolationPattern?: string,
  overrideIdFn?: Options['overrideIdFn'],
  preserveWhitespace?: Options['preserveWhitespace'],
  flatten?: Options['flatten']
)

}

export function evaluateMessageDescriptor(
  descriptorPath: MessageDescriptorPath,
  isJSXSource = false,
  filename: string | undefined,
  idInterpolationPattern?: string,
  overrideIdFn?: Options['overrideIdFn'],
  preserveWhitespace?: Options['preserveWhitespace'],
  flatten?: Options['flatten']
): MessageDescriptor {
  let id = getMessageDescriptorValue(descriptorPath.id)
  let defaultMessage = getICUMessageValue(
    descriptorPath.defaultMessage,
    {
      isJSXSource,
    },
    preserveWhitespace
  )
  const description = getMessageDescriptorValue(descriptorPath.description)

  // GH #3537: Apply flatten transformation before calling overrideIdFn
  // so that the ID generation sees the same message format as the final output
  if (flatten && defaultMessage) {
    try {
      defaultMessage = printAST(hoistSelectors(parse(defaultMessage)))
    } catch (e: any) {
      const loc = descriptorPath.defaultMessage?.node.loc
      const locationStr = loc
        ? ` at line ${loc.start.line}, column ${loc.start.column + 1}`
        : ''
      throw new Error(
        `[formatjs] Cannot flatten message in file "${filename}"${locationStr}${id ? ` with id "${id}"` : ''}: ${e.message}\nMessage: ${defaultMessage}`
      )
    }
  }

  if (overrideIdFn) {
    id = overrideIdFn(id, defaultMessage, description, filename)
  } else if (!id && idInterpolationPattern && defaultMessage) {
    id = interpolateName(
      {resourcePath: filename} as any,
      idInterpolationPattern,
      {
        content: description
          ? `${defaultMessage}#${description}`
          : defaultMessage,
      }
    )
  }
  const descriptor: MessageDescriptor = {
    id,
  }

  if (description) {
    descriptor.description = description
  }
  if (defaultMessage) {
    descriptor.defaultMessage = defaultMessage
  }